Have also just off-loaded my IS220D. 2.5 years old, 56K miles. It started to run like a dog a few months back.
I did have the Sports model at least - I never really got to 'love' the car, but I accepted it for most of my ownership. But it started to feel wrong - pulling away from junctions was becoming a nightmare, felt energy loss when slow-cruising on motorways a couple of times. Dropped to c37.5 mpg consumption.
I now have a spanking, stonking IS250 Auto. SE-I (with the metallic paint and wheel upgrade offer). 2010 model too - the big floppy gear flaps on the steering wheel have gone, Bluetooth and USB HDD now integral, and the rear lights have a funky profile shape.
In favour of the 220, the Sport option had lots of extras that I now miss (xenon, motion tracing headlamps in particular). Also, when cruising on motorway, the engine was a whisper, and the torques superb.
I did a trade-in, and the price was spot-on for the Parkers/Glass lower value. Plus, dealer had a 'loyalty' trade-in bonus (a sort of non-scrappage scrappage-scheme?!).
I did see my 220 on the Lexus used web-site for a week - now it's gone. The dealer may have made a nice little profit - good luck to them!
As for the 250, the engine is permanently a whisper! Less than 900 miles so far, it's just started to become fun to push a little. The auto gearing is great. And I've not yet used the nudge-tronic, nor the 'Power' mode option. So far so good - fingers crossed! If only those headlights were white-bright...
Oh yes - I went for the Tsuki 18-inch alloys - dealer said they were quite new - any thoughts...?
http://www.lexus.co.uk/range/is/accessories/exterior.aspx
Bobby.